C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b;
	cin>>a>>b;
	for(int i=1;i<=a;i++){
		for(int j=1;j<=b;j++){
			cout<<"!";
		}
		cout<<endl;	
	}
	
	return 0;
}

Python :

# coding=utf-8
m=int(input())
n=int(input())
for j in range(1,m+1):
    for i in range(1,n+1):
        if i!=n:
            print("!",end="")
        if i==n:
            print("!",end="\n")